Cassidy, DB;
Deng, SHM;
Tanaka, HKM;
Mills, AP;
Greaves, RG;
Maruo, T;
Nishiyama, N;
(2005)
Experiments with a high-density positronium gas.
Physical Review Letters
, 95
(19)
, Article 195006. 10.1103/PhysRevLett.95.195006.